1Fischell Department of Bioengineering, University of Maryland, 2Institute for Bioscience and Biotechnology Research, University of Maryland
Many therapeutic applications require safe and efficient transport of drug carriers and their cargoes across cellular barriers in the body. This article describes an adaptation of established methods to evaluate the rate and mechanism of transport of drug nanocarriers (NCs) across cellular barriers, such as the gastrointestinal (GI) epithelium.
Published October 17, 2013. Keywords: Bioengineering, Antigens, Enzymes, Biological Therapy, bioengineering (general), Pharmaceutical Preparations, Macromolecular Substances, Therapeutics, Digestive System and Oral Physiological Phenomena, Biological Phenomena, Cell Physiological Phenomena, drug delivery systems, targeted nanocarriers, transcellular transport, epithelial cells, tight junctions, transepithelial electrical resistance, endocytosis, transcytosis, radioisotope tracing, immunostaining
1Biotechnology and Applied Clinical Sciences Department, University of L'Aquila, 2ARC Centre of Excellence in Vision Science, 3John Curtin School of Medical Research, Australian National University, 4ANU Medical School, Australian National University
This paper details how Elvax 40W can be used as a slow-release method for drug delivery to the adult rat retina. The protocol for preparing, loading, and delivering the drug-resin complex to the eye is described.
Published September 17, 2014. Keywords: Medicine, slow-release drug delivery, Elvax 40W, co-polymer resin, eye, retina, rat, APB, retinal degeneration, treatment of chronic retinal conditions
1Department of Biomedical Engineering, Boston University, 2Department of Otology and Laryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School
A mouse model of human endoscopic skull base reconstruction has been developed that creates a semipermeable interface between the brain and nose using nasal mucosal grafts. This method allows researchers to study delivery to the central nervous system of high molecular weight therapeutics which are otherwise excluded by the blood-brain barrier when administered systemically.…
Published July 16, 2014. Keywords: Medicine, drug delivery, mucosa membrane, blood-brain barrier, neurosurgery, transnasal, mouse model
1Department of Biomedical Engineering, University of Texas at Austin
We describe a surgical technique that produces wire injury in the femoral artery of mice to induce neointimal hyperplasia to serve as a model testing system for the perivascular delivery of therapeutic compounds for the inhibition of restenosis.
Published February 10, 2015. Keywords: Medicine, vascular injury, neointimal hyperplasia, perivascular drug delivery, wire injury, mouse surgical model of restenosis
1Department of Neurological Surgery, University of California, San Francisco - UCSF
Thorough preclinical testing of drugs that act in the central nervous system often involves assessing and comparing drug biodistribution in association with specific routes of administration. Here, three commonly used methods of systemic delivery (intravenous, intraperitoneal, and oral) as well as a method for local delivery (convection-enhanced delivery) are demonstrated in mice.…
Published August 16, 2010. Keywords: Neuroscience, mouse, in vivo optical imaging, preclinical, central nervous system, fluorescent imaging, convection-enhanced delivery, oral gavage, intravenous injection, intraperitoneal injection
1The Texas Heart Institute at St. Luke's Episcopal Hospital, 2Department of Vascular Surgery, The Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University
We show here the in vivo insertion of an osmotic pump for constant local drug delivery and the creation of hindlimb ischemia in a mouse model. Moreover, the hindlimb vasculature is perfused with Microfil, a silicone radiopaque agent, to prepare for micro-computed tomography (micro-CT) imaging.
Published June 29, 2013. Keywords: Medicine, Immunology, Biomedical Engineering, Bioengineering, Molecular Biology, Cellular Biology, Pharmacology, Cardiovascular Diseases, Therapeutics, Hindlimb ischemia, ischemia, osmotic pump, drug delivery, Microfil, micro-computed tomography, 3D vessel imaging, vascular medicine, vasculature, CT, tomography, imaging, animal model
1Vascular Biology Program, Department of Surgery, Boston Children's Hospital and Harvard Medical School, 2Wyss Institute for Biologically Inspired Engineering, Harvard University, 3Harvard School of Engineering and Applied Sciences
A protocol for the non-invasive intraductal delivery of aqueous reagents to the mouse mammary gland is described. The method takes advantage of localized injection into the nipples of mammary glands targeting mammary ducts specifically. This technique is adaptable for a variety of compounds including siRNA, chemotherapeutic agents and small molecules.
Published October 4, 2013. Keywords: Developmental Biology, Mammary Glands, Animal, Drug Administration Routes, intraductal injection, local drug delivery, siRNA
JoVE Immunology and Infection
1Drug Delivery, Disposition, and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus)
Here we describe a technique to cannulate the mesenteric lymph duct in rats which enables quantification of lipid and drug transport via the lymphatic system following intestinal delivery. The technique can be adapted to assess mesenteric lymph concentrations and/or transport of fluid, immune cells, peptides, proteins and lipophilic molecules.
Published March 6, 2015. Keywords: Immunology, Intestine, Mesenteric, Lymphatic, Lymph, Carotid artery, Cannulation, Cannula, Rat, Drug, Lipid, Absorption, Surgery
1Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center
An example of a nano drug based on polymalic acid is presented towards the rational design of personalized medicine that is applicable to cancer. It describes the synthesis of a nano drug to treat Her2-positive human breast cancer in a nude mouse.
Published June 13, 2014. Keywords: Chemistry, Cancer treatment, personalized medicine, polymalic acid, nanodrug, biopolymer, targeting, host compatibility, biodegradability
1VECT-HORUS SAS, 2Aix-Marseille Université, CNRS, NICN UMR 7259
The aim of the present study was to validate the reproducibility of an in vitro BBB model involving a rat syngeneic co-culture of endothelial cells and astrocytes. The endothelial cell monolayer presented high TEER and low LY permeability. Expression of specific TJ proteins, functional responses to inflammation and functionality of transporters and receptors were assessed.…
Published June 28, 2014. Keywords: Medicine, rat brain endothelial cells (RBEC), mouse, spinal cord, tight junction (TJ), receptor-mediated transport (RMT), low density lipoprotein (LDL), LDLR, transferrin, TfR, P-glycoprotein (P-gp), transendothelial electrical resistance (TEER),
1Department of Nanomedicine, Houston Methodist Research Institute, 2MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, 3Pediatrics Department of Union Hospital, Huazhong University of Science and Technology, 4CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, National Center for Nanoscience & Technology of China, 5Department of Medicine, Weill Cornell Medical College, 6Department of Cell and Developmental Biology, Weill Cornell Medical College
Delivery remains the main challenge for the therapeutic implementation of small interfering RNA (siRNA). This protocol involves the use of a multifunctional and biocompatible siRNA delivery platform, consisting of arginine and polyethylenimine grafted porous silicon microparticles.
Published January 15, 2015. Keywords: Bioengineering, Porous silicon, siRNA, Nanodelivery system, Cancer therapy, Transfection, Polycation functionalization
1Alzheimer’s Research Center at Region’s Hospital, HealthPartners Institute for Education and Research
A method to intranasally administer drugs to awake mice for the purpose of targeting the brain is described. This method allows for repeat dosing over long periods using intranasal administration of drug without anesthesia, and nose-to-brain delivery with minimal systemic exposure.
Published April 8, 2013. Keywords: Medicine, Biomedical Engineering, Neuroscience, Anatomy, Physiology, Bioengineering, Neurobiology, Pharmacology, Intranasal, nasal, awake, mice, drug delivery, brain targeting, CNS, mouse acclimation, animal model, therapeutics, clinical techniques
1Department of Biomedical Engineering, University of Rochester, 2Department of Chemical Engineering, University of Rochester, 3Center for Musculoskeletal Research, University of Rochester Medical Center
This video will illustrate a rapid, efficient method to methacrylate poly(ethylene glycol), enabling chain polymerizations and hydrogel synthesis. It will demonstrate how to similarly introduce methacrylamide functionalities into peptides, detail common analytical methods to assess functionalization efficiency, provide suggestions for troubleshooting and advanced modifications, and demonstrate typical hydrogel characterization techniques.…
Published October 29, 2013. Keywords: Chemistry, Poly(ethylene glycol), peptides, polymerization, polymers, methacrylation, peptide functionalization, 1H-NMR, MALDI-ToF, hydrogels, macromer synthesis
JoVE Immunology and Infection
1Department of Biomedical Engineering, Vanderbilt University, 2Vanderbilt Institute for Nanoscale Science & Engineering, Vanderbilt University, 3Interdisciplinary Materials Science Program, Vanderbilt University, 4Monroe Carell Jr. Children's Hospital, Vanderbilt University Medical Center, 5Department of Chemical & Biomolecular Engineering, Vanderbilt University, 6Department of Cancer Biology, Vanderbilt University
A hemolysis assay can be used as a rapid, high-throughput screen of drug delivery systems' cytocompatibility and endosomolytic activity for intracellular cargo delivery. The assay measures the disruption of erythrocyte membranes as a function of environmental pH.
Published March 9, 2013. Keywords: Immunology, Cellular Biology, Medicine, Biomedical Engineering, Bioengineering, Cancer Biology, Molecular Biology, Erythrocytes, Endosomes, Small Interfering RNA, Gene Therapy, Nanomedicine, Gene delivery, Nanoparticles, Endosome Escape, Intracellular Trafficking, Cytosolic Drug Delivery, red blood cells, assay
1School of Pharmacy, Pacific University, 2Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University
The goal of this protocol is to describe the preparation and characterization of physically entrapped, poorly water soluble drugs in micellar drug delivery systems composed of amphiphilic block copolymers.
Published August 28, 2015. Keywords: Chemistry, Amphiphilic block copolymers, Polymeric micelles, drug delivery, in vitro characterization, chemotherapy, multi-drug loading, nanocarriers
1Department of Biomedical Engineering, Boston University, 2Departments of Biomedical Engineering, Chemistry, and Medicine, Boston University
Two- and three-dimensional superhydrophobic polymeric materials are prepared by electrospinning or electrospraying biodegradable polymers blended with a lower surface energy polymer of similar composition.
Published August 28, 2015. Keywords: Bioengineering, Electrospinning, electrospraying, polycaprolactone, poly(lactide-co-glycolide), microfiber, nanofiber, microparticles, superhydrophobic, biomaterials, drug delivery, biodegradable, surface coatings.
1Institute for Complex Molecular Systems, Department of Biomedical Engineering, Laboratory of Chemical Biology, Eindhoven University of Technology, 2Department of Cardiology, Division Heart and Lungs, Interuniversity Cardiology Institute of the Netherlands (ICIN), University Medical Center Utrecht
Supramolecular hydrogelators based on ureido-pyrimidinones allow full control over the macroscopic gel properties and the sol–gel switching behavior using pH. Here, we present a protocol for formulating and injecting such a supramolecular hydrogelator via a catheter delivery system for local delivery directly in relevant areas in the pig heart.
Published June 7, 2015. Keywords: Bioengineering, supramolecular polymers, hydrogels, catheter injection, drug delivery, pH switchability, pig model
1Barrow Brain Tumor Research Center, Barrow Neurological Institute
We describe the production and characterization of nanoparticles and microparticles composed of poly(lactic-co-glycolic acid) using vitamin E-TPGS as an emulsifier. By varying formulation parameters such as the concentration of emulsifier, it is possible to produce nanoparticles with mean diameters ranging from 220 nm to 1.98 µm.
Published December 27, 2013. Keywords: Chemistry, Nanoparticles, Microparticles, PLGA, TPGS, drug delivery, scanning electron microscopy, emulsion, polymers
1University of Tennessee Health Science Center, 2Semmes-Murphey Clinic, 3University of Arkansas for Medical Sciences, 4Restorative Neurosciences Foundation
Convection-enhanced delivery (CED) has been proposed as a treatment option for a wide range of neurological diseases. In order to prepare health care professionals for adoption of CED, accessible training models are needed. We describe the use of agarose gel as such a model of the human brain for testing, research, and training.
Published May 14, 2014. Keywords: Medicine, Convection-enhanced delivery, agarose gel, volumes of distribution, gel infusion, Vd/Vi, MRI, Neurosurgery
1Department of Chemical Engineering, Massachusetts Institute of Technology, 2David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology
Rapid mechanical deformation of cells has emerged as a promising, vector-free method for intracellular delivery of macromolecules and nanomaterials. This protocol provides detailed steps on how to use the system for a broad range of applications.
Published November 7, 2013. Keywords: Bioengineering, Transfection, microfluidic, vector-free, protein delivery, intracellular delivery, quantum dot delivery, cell reprogramming, siRNA
1Department of Psychology, Center for Studies in Behavioral Neurobiology, Concordia University
A procedure to study the capacity of an alcohol associated environmental context to trigger the renewal of alcohol-seeking behavior in rats is described.
Published September 19, 2014. Keywords: Behavior, Behavioral neuroscience, alcoholism, relapse, addiction, Pavlovian conditioning, ethanol, reinstatement, discrimination, conditioned approach
1Department of Biomedical Engineering, The University of Akron
A protocol for robotic printing of cancer cell spheroids in a high throughput 96-well plate format using an aqueous two-phase system is presented.
Published April 23, 2015. Keywords: Bioengineering, Cancer Cell Spheroid, 3D Culture, Robotic, High Throughput, Co-Culture, Drug Screening
1Psychology, University of Toronto Scarborough
Animal models of relapse, known as reinstatement procedures, have been used extensively to study the role of stress in relapse to drug seeking. Here, we report on a method for inducing the reinstatement of cocaine seeking in laboratory rats via acute exposures to mild, intermittent electric footshock.
Published January 6, 2011. Keywords: Neuroscience, Relapse, Reinstatement, Cocaine, Rat, Footshock, Stress, Intravenous, Self-administration, Operant Conditioning
1Experimental Radiology, Institute of Diagnostic and Interventional Radiology I, Jena University Hospital, 2Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, 3Center for Electron Microscopy, Jena University Hospital
The use of fluorophores for in vivo imaging can be greatly limited by opsonization, rapid clearance, low detection sensitivity and cytotoxic effects on the host. Encapsulation of fluorophores in liposomes by film hydration and extrusion leads to fluorescence quenching and protection which enables in vivo imaging with high detection sensitivity.
Published January 5, 2015. Keywords: Bioengineering, Drug-delivery, Liposomes, Fluorochromes, Fluorescence-quenching, Optical imaging, Inflammation
1Watson School of Biological Sciences, 2Cold Spring Harbor Laboratory, 3Departments of Medical Genetics, University of Oslo and Oslo University Hospital
We describe a method for imaging response to anti-cancer treatment in vivo and at single cell resolution.
Published March 24, 2013. Keywords: Cancer Biology, Medicine, Molecular Biology, Cellular Biology, Biomedical Engineering, Genetics, Oncology, Pharmacology, Surgery, Tumor Microenvironment, Intravital imaging, chemotherapy, Breast cancer, time-lapse, mouse models, cancer cell death, stromal cell migration, cancer, imaging, transgenic, animal model
1Division of Biology, Kansas State University, 2Department of Medical and Molecular Genetics, Indiana University School of Medicine, 3Eck Institute for Global Health, University of Notre Dame, 4Department of Biological Sciences, University of Notre Dame, 5Department of Entomology, Kansas State University
Here we describe a procedure for inhibiting gene function in disease vector mosquitoes through the use of chitosan/interfering RNA nanoparticles that are ingested by larvae.
Published March 25, 2015. Keywords: Molecular Biology, vector biology, RNA interference, Anopheles gambiae, Aedes aegypti, dsRNA, siRNA, knockdown, ingestion, mosquito, larvae, development, disease
1Department of Cardiology, Boston Children's Hospital, Harvard Medical School, 2Department of Anesthesiology and Critical Care, Children's Hospital of Philadelphia, University of Pennsylvania
We describe methods for the manufacture of large volumes of lipid-based oxygen microbubbles (LOMs) designed for intravenous oxygen delivery using high-shear homogenization and serial concentration.
Published May 26, 2014. Keywords: Bioengineering, oxygen, microparticles, microbubbles, homogenization, encapsulation, lipid monolayer, drug delivery
1Department of Physics and Astronomy, Rowan University, 2Department of Biomedical and Translational Sciences, Rowan University, 3Department of Biomedical Sciences, Cooper Medical School of Rowan University, 4Department of Chemistry and Biochemistry, Rowan University
Blending is an efficient approach to generate biomaterials with a broad range of properties and combined features. By predicting the molecular interactions between different natural silk proteins, new silk-silk protein alloy platforms with tunable mechanical resiliency, electrical response, optical transparency, chemical processability, biodegradability, or thermal stability can be designed.…
Published August 13, 2014. Keywords: Bioengineering, protein alloys, biomaterials, biomedical, silk blends, computational simulation, implantable electronic devices
1School of Molecular Medical Sciences, University of Nottingham, 2Division of Drug Delivery and Tissue Engineering, University of Nottingham, 3Laboratory of Biophysics and Surface Analysis, University of Nottingham
Biocompatible pH responsive sol-gel nanosensors can be incorporated into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds. The produced self-reporting scaffolds can be used for in situ monitoring of microenvironmental conditions whilst culturing cells upon the scaffold. This is beneficial as the 3D cellular construct can be monitored in real-time without disturbing the experiment.…
Published November 7, 2013. Keywords: Bioengineering, Biocompatible Materials, Nanosensors, scaffold, electrospinning, 3D cell culture, PLGA
1Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center
Nanoparticles of indinavir, ritonavir, efavirenz and atazanavir were manufactured using wet milling, homogenization and ultrasonication. These nanoformulations, collectively termed nanoformulated antiretroviral therapy (nanoART), assessed macrophage-based drug delivery. Monocyte-derived macrophage nanoART uptake, retention and sustained release were determined. These preliminary studies suggest the potential of nanoART for clinical use.…
Published December 9, 2010. Keywords: Immunology, NanoART, antiretroviral, HIV/AIDS, monocytes/macrophages, wet milling, homogenization, ultrasonication
1Department of Obstetrics, Perinatal Pharmacology, University Hospital Zurich, 2Laboratory for Materials - Biology Interactions, EMPA Swiss Federal Laboratories for Materials Testing and Research, 3Graduate School for Cellular and Biomedical Sciences, University of Bern
The ex vivo dual recirculating human placental perfusion model can be used to investigate the transfer of xenobiotics and nanoparticles across the human placenta. In this video protocol we describe the equipment and techniques required for a successful execution of a placenta perfusion.
Published June 18, 2013. Keywords: Biomedical Engineering, Medicine, Bioengineering, Anatomy, Physiology, Molecular Biology, Biochemistry, Biophysics, Pharmacology, Obstetrics, Nanotechnology, Placenta, Pharmacokinetics, Nanomedicine, humans, ex vivo perfusion, perfusion, biological barrier, xenobiotics, nanomaterials, clinical model
1Interdepartmental Neuroscience Program, Yale University, 2Department of Biotechnical and Clinical Laboratory Sciences, School of Medicine and Biomedical Sciences, University at Buffalo, 3Department of Psychiatry, Yale School of Medicine, 4Department of Cellular and Molecular Physiology, Yale School of Medicine
Rapid fluctuations in extracellular dopamine (DA) mediate both reward processing and motivated behavior in mammals. This manuscript describes the combined use of fast scan cyclic voltammetry (FSCV) and intra-oral tastant administration to determine how tastants alter rapid dopamine release in awake, freely moving rats.
Published August 12, 2015. Keywords: Behavior, Reward, dopamine, voltammetry, nucleus accumbens, taste, intra-oral delivery, sucrose, menthol, freely moving
1Department of Pediatrics, University of Colorado School of Medicine
The brain is a unique site with qualities that are not well represented by in vitro or ectopic analyses. Orthotopic mouse models with reproducible location and growth characteristics can be reliably created with intracranial injections using a stereotaxic fixation instrument and a low pressure syringe pump.
Published September 24, 2014. Keywords: Medicine, intracranial, glioblastoma, mouse, orthotopic, brain tumor, stereotaxic, micropump, brain injection
1Department of Biomedical Engineering, University of Virginia, 2Neurological Surgery , University of Virginia
Insonation of microbubbles is a promising strategy for tumor ablation at reduced time-averaged acoustic powers, as well as for the targeted delivery of therapeutics. The purpose of the present study is to develop low duty cycle ultrasound pulsing strategies and nanocarriers to maximize non-thermal microvascular ablation and payload delivery to subcutaneous C6 gliomas.
Published December 15, 2010. Keywords: Medicine, microbubbles, targeted drug delivery, nanoparticles, ultrasound
1Department of Biomedical Engineering, University of Southern California, 2Department of Biomedical Sciences, Cedars-Sinai Medical Center, 3Geffen School of Medicine, University of California, Los Angeles
This article details the procedures for optical imaging analysis of the tumor-targeted nanoparticle, HerDox. In particular, detailed use of the multimode imaging device for detecting tumor targeting and assessing tumor penetration is described here.
Published June 18, 2013. Keywords: Biomedical Engineering, Cancer Biology, Medicine, Bioengineering, Molecular Biology, Cellular Biology, Biochemistry, Nanotechnology, Nanomedicine, Drug Delivery Systems, Molecular Imaging, optical imaging devices (design and techniques), HerDox, Nanoparticle, Tumor, Targeting, Self-Assembly, Doxorubicin, Human Epidermal Growth Factor, HER, HER2+, Receptor, mice, animal model, tumors, imaging
1Department of Neurology, Washington University in St. Louis School of Medicine
We describe a method to target drugs to the central nervous system by either implanting a catheter or performing a bolus injection into the right lateral ventricle in mice. We focus specifically on the delivery of antisense oligonucleotides. This technique is readily adaptable to other drugs and to rats.
Published May 12, 2013. Keywords: Neurobiology, Neuroscience, Medicine, Biomedical Engineering, Genetics, Anatomy, Physiology, Surgery, Pharmacology, Cerebrospinal Fluid, Rodentia, Oligonucleotides, Antisense, Drug Administration Routes, Injections, Intraventricular, Drug Delivery Systems, mouse, rat, brain, antisense oligonucleotide, osmotic pump, Bolus, Ventricle, Neurosciences, Translational, Cerebrospinal fluid, CNS, cannula, catheter, animal model, surgical techniques
1Department of Biomedical Engineering, The University of Akron, 2Saint Vincent Saint Mary's High School
This work describes the formation of poly(ethylene glycol) (PEG) microgels via a photopolymerized precipitation reaction. Increasing the PEG molecular weight increased microgel diameter and swelling ratio. Simple adaptations to the PEG microgel precipitation reaction are explored for future applications of microgels as drug delivery vehicles and tissue engineering scaffolds.…
Published December 23, 2013. Keywords: Bioengineering, hydrogels, microgels, polyethylene glycol, molecuar weight, photopolymerized precipitation reaction, polymers, polydispersity index
1Departments of Chemistry and Cell and Molecular Biology, The Scripps Research Institute, 2Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University
Zinc-finger domains are intrinsically cell-permeable and capable of mediating protein delivery into a broad range of mammalian cell types. Here, a detailed step-by-step protocol for implementing zinc-finger technology for intracellular protein delivery is presented.
Published March 25, 2015. Keywords: Molecular Biology, protein delivery, cell-penetrating peptide, zinc-finger, protein transduction domain, chemical biology, molecular biology
1Laboratory of Nano- and Translational Medicine, Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, 2Carolina Center for Nanotechnology Excellence, University of North Carolina
This article describes a nanoprecipitation method to synthesize polymer-based nanoparticles using diblock co-polymers. We will discuss the synthesis of diblock co-polymers, the nanoprecipitation technique, and potential applications.
Published September 20, 2011. Keywords: Bioengineering, Nanoparticles, nanomedicine, drug delivery, polymeric micelles, polymeric nanoparticles, diblock co-polymers, nanoplatform, nanoparticle molecular imaging, polymer conjugation.
1Department of Biomedical Engineering, National University of Singapore, 2Mechanobiology Institute, Singapore, National University of Singapore, 3Department of Surgery, National University of Singapore
Scaffolds for tissue engineering need to recapitulate the complex biochemical and biophysical microenvironment of the cellular niche. Here, we show the use of interfacial polyelectrolyte complexation fibers as a platform to create composite, multi-component polymeric scaffolds with sustained biochemical release.
Published August 19, 2015. Keywords: Bioengineering, composite scaffold, polymer, hydrogel, biochemicals, encapsulation, temporal, spatial, sustained release, topography
1The Rowland Institute, Harvard University
A microfluidic vortex assisted electroporation platform was developed for sequential delivery of multiple molecules into identical cell populations with precise and independent dosage control. The system’s size based target cell purification step preceding electroporation aided to enhance molecular delivery efficiency and processed cell viability.
Published August 7, 2014. Keywords: Bioengineering, electroporation, microfluidics, cell isolation, inertial focusing, macromolecule delivery, molecular delivery mechanism
1Department of Chemistry, Massachusetts Institute of Technology
Poly(ethylene glycol) (PEG) brush-arm star polymers (BASPs) with narrow mass distributions and tunable nanoscopic sizes are synthesized in via ring opening metathesis polymerization (ROMP) of a PEG-norbornene macromonomer followed by transfer of portions of the resulting living brush initiator to vials containing varied amounts of a rigid, photo-cleavable bis-norbornene crosslinker.…
Published October 10, 2013. Keywords: Chemistry, Chemical Engineering, Nanoparticles, Polymers, Drug Delivery Systems, Polymerization, polymers, Biomedical and Dental Materials, brush first, polyethylene glycol, photodegradable, ring opening metathesis polymerization, brush polymer, star polymer, drug delivery, gel permeation chromatography, arm first, core functional, photocleavable
1Biomedical Engineering Department, Johns Hopkins University School of Medicine, 2Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 3Wilmer Eye Institute, Johns Hopkins University School of Medicine, 4Institute for Nanobiotechnology, Johns Hopkins University School of Medicine
A protocol for nanoparticle tracking analysis (NTA) and high-throughput flow cytometry to evaluate polymeric gene delivery nanoparticles is described. NTA is utilized to characterize the nanoparticle particle size distribution and the plasmid per particle distribution. High-throughput flow cytometry enables quantitative transfection efficacy evaluation for a library of gene delivery biomaterials.…
Published March 1, 2013. Keywords: Biomedical Engineering, Bioengineering, Tissue Engineering, Cellular Biology, Medicine, Genetics, Biocompatible Materials, Biopolymers, Drug Delivery Systems, Nanotechnology, bioengineering (general), Therapeutics, Nanoparticle, poly(beta-amino ester), high-throughput, transfection, nanoparticle tracking analysis, biomaterial, gene delivery, flow cytometry
1School of Sport, Health and Exercise Sciences, Bangor University, 2Department of Rheumatology, Dudley Group of Hospitals NHS Trust, Russells Hall Hospital, 3Arthritis Research UK Epidemiology Unit, University of Manchester
The present article describes the methodological considerations for several non-invasive assessments of vascular function and morphology that are commonly used in medical research to assess different stages of atherosclerosis.
Published February 7, 2015. Keywords: Medicine, Endothelium, Cardiovascular, Flow-mediated dilatation, Carotid intima-media thickness, Atherosclerosis, Nitric oxide, Microvasculature, Laser Doppler Imaging
1Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, The Johns Hopkins Hospital, 2Clinical Informatics, Interventional, and Translational Solutions (CIITS), Philips Research North America, 3Center for Interventional Oncology, Interventional Radiology Section, National Institutes of Health, 4Interventional X-ray, Philips Healthcare
Dual-phase cone-beam computed tomography (DP-CBCT) is a useful intraprocedural imaging technique for transarterial chemo-embolization treatment with drug-eluting beads of hepatocellular carcinoma. DP-CBCT has been used to perform three major steps in oncologic interventional radiology: tumor localization (see), navigation and intraprocedural catheter guidance (reach), and intraprocedural evaluation of treatment success (treat).…
Published December 2, 2013. Keywords: Medicine, Carcinoma, Hepatocellular, Tomography, X-Ray Computed, Surgical Procedures, Minimally Invasive, Digestive System Diseases, Diagnosis, Therapeutics, Surgical Procedures, Operative, Equipment and Supplies, Transarterial chemo-embolization, Hepatocellular carcinoma, Dual-phase cone-beam computed tomography, 3D roadmap, Drug-Eluting Beads
1Fischell Department of Bioengineering, University of Maryland, College Park
Lymph nodes are the immunological tissues that orchestrate immune response and are a critical target for vaccines. Biomaterials have been employed to better target lymph nodes and to control delivery of antigens or adjuvants. This paper describes a technique combining these ideas to inject biocompatible polymer particles into lymph nodes.
Published January 2, 2014. Keywords: Bioengineering, biomaterial, immunology, microparticle, nanoparticle, vaccine, adjuvant, lymph node, targeting, polymer
1Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, 2Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, 3Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, 4Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania
Loss of the righting reflex has long served as a standard behavioral surrogate for unconsciousness, also called hypnosis, in laboratory animals. Alterations in volatile anesthetic sensitivity caused by pharmacological interventions can be detected with a carefully controlled high-throughput assessment system, which may be adapted for delivery of any inhaled therapeutic.…
Published October 16, 2013. Keywords: Medicine, Anatomy, Physiology, Pharmacology, Anesthesia, Inhalation, Behavioral Research, General anesthesia, loss of righting reflex, isoflurane, anesthetic sensitivity, animal model
1Biomedical Engineering, University of Southern California, 2Ophthalmology, University of Southern California
The goal of this protocol is to show an effective technique to isolate whole, intact vitreous core and cortex from post mortem enucleated porcine eyes.
Published May 24, 2015. Keywords: Medicine, Vitreous Humor, Dissection, Vitreous core, Vitreous cortex, Medicine, Eye, vitreodynamics, drug delivery, diffusion
1Department of Neurosurgery, University Medical Center Utrecht, 2Brain Center Rudolf Magnus, University Medical Center Utrecht
Extracellular vesicles play important roles in physiological and pathological processes, including coagulation, immune responses, and cancer or as potential therapeutic agents in drug delivery or regenerative medicine. This protocol presents methods for the quantification and size characterization of isolated and non-isolated extracellular vesicles in various fluids using tunable resistive pulse sensing.…
Published October 19, 2014. Keywords: Bioengineering, exosomes, microvesicles, extracellular vesicles, quantification, characterization, Tunable Resistive Pulse Sensing, qNano
1Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, Harvard Medical School, 2School of Medicine, Pontifical Catholic University of Ecuador, 3Charité University Medicine Berlin, 4The City College of The City University of New York, 5Headache & Orofacial Pain Effort (H.O.P.E.), Biologic & Materials Sciences, School of Dentistry, University of Michigan
High-definition transcranial direct current stimulation (HD-tDCS), with its 4x1-ring montage, is a noninvasive brain stimulation technique that combines both the neuromodulatory effects of conventional tDCS with increased focality. This article provides a systematic demonstration of the use of 4x1 HD-tDCS, and the considerations needed for safe and effective stimulation.…
Published July 14, 2013. Keywords: Medicine, Neurobiology, Neuroscience, Physiology, Anatomy, Biomedical Engineering, Biophysics, Neurophysiology, Nervous System Diseases, Diagnosis, Therapeutics, Anesthesia and Analgesia, Investigative Techniques, Equipment and Supplies, Mental Disorders, Transcranial direct current stimulation, tDCS, High-definition transcranial direct current stimulation, HD-tDCS, Electrical brain stimulation, Transcranial electrical stimulation (tES), Noninvasive Brain Stimulation, Neuromodulation, non-invasive, brain, stimulation, clinical techniques